The Road to Stormwater Management: MDOT s MS4 Permitting. Meredith Cote Dan DeVaun Chris Potvin June 2017
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1 The Road to Stormwater Management: MDOT s MS4 Permitting Meredith Cote Dan DeVaun Chris Potvin June 2017
2 Outline MS4 Definition MDOT s Uniqueness as an MS4 EPA Requirements Features of Existing Stormwater Management Plan Features of New Stormwater Management Plan New Activities (Focus on Post-Construction) Conclusions : Improved Stormwater Management and design tools
3 What is an MS4? A Municipal Separate Storm Sewer System (MS4) is a conveyance or system of conveyances Collects or conveys stormwater (storm drains, pipes, ditches, etc.) Not a combined sewer Not part of a Publicly Owned Treatment Works
4 Why Do MS4 s Exist? MS4 s are regulated by the EPA to address water quality issues Regulated via a National Pollutant Discharge Elimination System (NPDES) permit Goal: Improve and maintain water quality in waters of the state
5 How is MDOT Different? Roads Buildings Garages Maintenance Facilities Laboratories BMPs Welcome Centers Rest Areas Scenic Turnouts
6 EPA Requirements Six Minimum Measures Public Education Public Involvement and Participation Illicit Discharge Elimination Plan Post Construction Stormwater Management for New Development and Redevelopment Projects Construction Stormwater Runoff Control Pollution Prevention/Good Housekeeping for MDOT Operations Current permit utilizes Maximum Extent Practicable (MEP) for six minimum measures
7 Existing SWMP Public Education and Outreach Stormwater Information on MDOT Website Partner with MDEQ s Public Education Program Work with MDEQ for Early Coordination Training Modules Pesticide/Fertilizer Certification Illicit Discharge Detection and Elimination Dry Weather Screening Notify MDEQ of Illicit Discharges Map Outfalls (statewide) Public Participation/Involvement Public Review of SWMP Identify and Coordinate with MPOs with Stormwater Quality Control Programs Construction Site Runoff Control QAQC for Construction Storm Water Control Post-Construction Runoff Control TMDL Compliance Update Drainage Manual Select, Apply, Maintain BMPs Pollution Prevention/Good Housekeeping Maintenance Requirements for MDOT BMPs Document Road Maintenance Activities BMP Inspections Garage Inspections
8 Revised SWMP Public Education and Outreach Stormwater Information on MDOT Website Partner with MDEQ s Public Education Program Work with MDEQ for Early Coordination Training Modules Pesticide/Fertilizer Certification Illicit Discharge Detection and Elimination Dry Weather Screening (Pilot Project) Notify MDEQ of Illicit Discharges Map Outfalls (statewide) Maintain List of Construction Projects Determine IDEP Effectiveness Public Participation/Involvement Public Review of SWMP Identify and Coordinate with MPOs with Stormwater Quality Control Programs Construction Site Runoff Control QAQC for Construction Storm Water Control Post-Construction Runoff Control TMDL Compliance Update Drainage Manual Select, Apply, Maintain BMPs BMP Mapping Water Quality/Channel Protection Pollution Prevention/Good Housekeeping Maintenance Requirements for MDOT BMPs Document Road Maintenance Activities BMP Inspections Garage Inspections
9 Structural BMP Map Initial BMP Map, Updated Annually
10 Water Quality & Channel Protection Performance Criteria WQv Treat runoff from 90% (non-exceedance) storm events. Channel Protection maintain runoff volume for 2-yr, 24-hr event. Developing MDOT specific design standards for numerous BMP s. Anticipate development of tools to assist designers. MDOT looking to address water quality and quantity standards within project limits.
11 BMP Screening Tool Excel-based tool for BMP Screening based on: New impervious area Site Conditions (soils, urban v. rural) Site Risks Impacting Cost/Constructability (high GW, utilities, ROW, accessibility) Water Quality Requirements (TSS, metals, P, N, etc.)
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17 PCBMP Design Manual Supplemental Manual to Aid in Design of Structural BMPs Augmented List of BMPs, compared to previous Drainage Manual Cook book approach to design
18 PCBMP Design Manual Incorporates: pollutant removal, water quality and channel protection design equations, maintenance procedures, design details, etc.) Pennsylvania DOT Drainage Manual Draws from SEMCOG manual and BMP manuals for other states Ohio BMP Manual
19 Conclusions Through a combination of ongoing MDOT activities developed in the previous permit cycle and new commitments in our upcoming permit, MDOT will strive to meet the requirements for stormwater water quality and channel protection Through this process, new deliverables will be available for not only MDOT but also the general public, paving the way for cleaner water
20 Questions? Dan DeVaun Meredith Cote Chris Potvin
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